Galvanized supply lines corroding from the inside
Why it happens here
Rosedale's 1890s-1920s homes with 1940s-60s infill used galvanized steel supply lines, with early copper in places — and because a small residential enclave beside the South Broadway corridor, so corridor blocks and interior blocks behave differently, the zinc coating is wearing away on the same schedule across the neighborhood. Pressure drops, water discolours, and pinhole leaks start behind walls, house after house.
Our approach
We pressure-test the system in Rosedale and, where corrosion is isolated, replace that section. Where it runs through the house, we plan a repipe and show the pressure readings before and after — and in a small enclave of 1890s–1920s houses, the test is read house by house, since the 1940s–60s infill on the same streets does not share the oldest lines' corrosion.